D.c. to a.c. converter with negative feedback stabilization

Claim 1

APPARATUS FOR CONVERTING DIRECT CURRENT FROM A POWER SOURCE TO ALTERNATING CURRENT, SAID APPARATUS COMPRISING IN COMBINATION: A TRANSFORMER, A FIRST SWITCH HAVING INPUT, OUTPUT AND CONTROL TERMINALS, A SECOND SWITCH HAVING INPUT, OUTPUT AND CONTROL TERMINALS, MEANS FOR CONNECTING THE POWER SOURCE BETWEEN AN INTERMEDIATE TAP ON THE PRIMARY WINDING OF THE TRANSFORMER AND THE INPUT TERMINALS OF THE SWITCHES, MEANS CONNECTING BOTH OUTPUT TERMINALS OF THE SWITCHES TO OPPOSITE POINTS ADJACENT THE RESPECTIVE ENDS OF SAID PRIMARY WINDING, MEANS CONSTITUTING A PAIR OF POSITIVE FEED-BACK LOOPS CONNECTING THE RESPECTIVE CONTROL TERMINALS TO DIFFERENT POINTS ON THE SECONDARY WINDING OF THE TRANSFORMER, MEANS COMPRISING A PAIR OF NEGATIVE FEED-BACK LOOPS CONNECTING SAID RESPECTIVE CONTROL TERMINALS TO POINTS ON THE SECONDARY WINDING WHICH ARE OPPOSITE IN POLARITY TO THE POINTS TO WHICH THE POSITIVE FEED-BACK LOOPS ARE CONNECTED, THE MEANS COMPRISING EACH NEGATIVE FEED-BACK LOOP INCLUDING A UNI-DIRECTIONAL CONDUCTIVE DEVICE POLED TO PREVENT CONDUCTION IN SAID LOOP UNTIL A PREDETERMINED VOLTAGE OF APPROPRIATE POLARITY IS EXCEEDED ACROSS SAID DEVICE.